Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized cost
Amortized Cost	$ 95,263	$ 97,662
Allowance for credit losses
Less - Allowance for credit losses	13,390	0
Net of Allowance
Net of Allowance	81,873	97,662
Gross unrecognized gains
Gross Unrealized Gains	3,085	9,386
Gross unrealized losses
Gross Unrealized Losses	4,558	1,938
Fair Value
Fair value	$ 80,400	$ 105,110
Weighted Average Yield
Weighted Average Yield	3.40%	3.49%
Obligations of Puerto Rico, States and political subdivisions
Amortized cost
Amortized cost - Within 1 year	$ 3,920	$ 3,745
Amortized cost - After 1 to 5 years	16,390	17,580
Amortized cost - After 5 to 10 years	16,660	18,195
Amortized cost - After 10 years	46,191	46,036
Amortized Cost	83,161	85,556
Allowance for credit losses
Allowance for credit losses - Within 1 Year	191
Allowance for credit losses - After 1 to 5 years	1,683
Allowance for credit losses - After 5 to 10 years	1,424
Allowance for credit losses - After 10 years	10,092
Less - Allowance for credit losses	13,390	0
Net of Allowance
Net of Allowance - Within 1 Year	3,729
Net of Allowance - After 1 to 5 Years	14,707
Net of Allowance - After 5 to 10 Years	15,236
Net of Allowance - After 10 Years	36,099
Net of Allowance	69,771
Gross unrecognized gains
Gross unrealized gains - Within 1 year	0	0
Gross unrealized gains - After 1 to 5 years	0	0
Gross unrealized gains - After 5 to 10 years	0	0
Gross unrealized gains - After 10 years	3,083	9,384
Gross Unrealized Gains	3,083	9,384
Gross unrealized losses
Gross unrealized losses - Within 1 year	27	11
Gross unrealized losses - After 1 to 5 years	131	320
Gross unrealized losses - After 5 to 10 years	1,880	1,607
Gross unrealized losses - After 10 years	2,520	0
Gross Unrealized Losses	4,558	1,938
Fair Value
Fair Value - within 1 year	3,702	3,734
Fair Value - After 1 to 5 years	14,576	17,260
Fair Value - After 5 to 10 years	13,356	16,588
Fair Value - After 10 years	36,662	55,420
Fair value	$ 68,296	$ 93,002
Weighted Average Yield
Weighted average yield - Within 1 Year	6.05%	6.01%
Weighted average yield - After 1 to 5 years	6.13%	6.11%
Weighted average yield - After 5 to 10 years	2.81%	3.11%
Weighted average yield - After 10 years	1.65%	1.67%
Weighted Average Yield	2.97%	3.08%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 41	$ 45
Amortized Cost	41	45
Allowance for credit losses
Allowance for credit losses - After 1 to 5 years	0
Less - Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - After 1 to 5 Years	41
Net of Allowance	41
Gross unrecognized gains
Gross unrealized gains - After 1 to 5 years	2	2
Gross Unrealized Gains	2	2
Gross unrealized losses
Gross unrealized losses - After 1 to 5 years	0	0
Gross Unrealized Losses	0	0
Fair Value
Fair Value - After 1 to 5 years	43	47
Fair value	$ 43	$ 47
Weighted Average Yield
Weighted average yield - After 1 to 5 years	6.44%	6.44%
Weighted Average Yield	6.44%	6.44%
Securities in wholly owned statutory business trusts
Amortized cost
Amortized cost - After 10 years	$ 11,561	$ 11,561
Amortized Cost	11,561	11,561
Allowance for credit losses
Allowance for credit losses - After 10 years	0
Less - Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - After 10 Years	11,561
Net of Allowance	11,561
Gross unrecognized gains
Gross unrealized gains - After 10 years	0	0
Gross Unrealized Gains	0	0
Gross unrealized losses
Gross unrealized losses - After 10 years	0	0
Gross Unrealized Losses	0	0
Fair Value
Fair Value - After 10 years	11,561	11,561
Fair value	$ 11,561	$ 11,561
Weighted Average Yield
Weighted average yield - After 10 years	6.51%	6.51%
Weighted Average Yield	6.51%	6.51%
Other
Amortized cost
Amortized cost - Within 1 year	$ 500	$ 500
Amortized Cost	500	500
Allowance for credit losses
Allowance for credit losses - Within 1 Year	0
Less - Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - Within 1 Year	500
Net of Allowance	500
Gross unrecognized gains
Gross unrealized gains - Within 1 year	0	0
Gross Unrealized Gains	0	0
Gross unrealized losses
Gross unrealized losses - Within 1 year	0	0
Gross Unrealized Losses	0	0
Fair Value
Fair Value - within 1 year	500	500
Fair value	$ 500	$ 500
Weighted Average Yield
Weighted average yield - Within 1 Year	2.97%	2.97%
Weighted Average Yield	2.97%	2.97%

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